Compound water heater



Patented y' vEIJIVIERS? STACKfOF SQMERWLLE.MASSACHUSETTS f '1 Appncation inea Januaryza, 1927. serial 110.162.763. .ThefpresentinYentOLrelatestoapparatus sheets l 1 2` and 13. This str-ucturetflnay be `orghe'ating watergandjhasfor itsob'ject to made as l aqsingle,integralcasting; ifjdesirech `provide means by v vhiehwater,containedin and is preferably provided Withjiiangesj or d ierent pipe-systems ortanlzsmaybe heated ln'gs '1st-andV 15v for connection offse'parable 'i 5 in the same; heating unit with circulation of heads or-ttings 16and 17. 11 water in each-systemand withoutdrainiupon, Extendingbetween the tube sheets 12 and orinterference with 'the circulation ofwaterf -13"aretubes 18, for conveyingfthe water in n,feith e`r system Jwhenw'vater isjdrawnfrom .Course beingheated, .the ends of which the othersystem.;The'inyention is preferpass into holes inthe tubesheets andare f i g 1,774,041

10 ably e bodied-in a single unitpieceof ap; made-fast therein.vr Thesevtubes areprefen 6o j paratuswhiomffor convenience of descrlp- `ably somewhatbentbetween'their y.ends in tion, 'I call/a heater', fandf have entitled, for y. orderto accommodate" themselves .to unequal thepurposesofthis specificatiom 'aficom expansion.; and contraction of the.sh ell ,..due pound water .f-heate`r lThe preferr-e d struc-r .to gtemp'erature changes', without; lslipping or l5 turaloharac-teristics Volif the V.invention 'are"working loosefat'their points of connection shownf in two; embodmentsjandfinconnecwith the tube. sheets. Any desired number tionwith d ierentheatingfsystems,villustratf of such tubes may be providedin the. heatingsome ofthe-possibleuses'thereof,'in the ingunityfhayingregard to the. sizefoit the accompanying drawing s,j andare explained vshell and tlieprope'r.size'v of the v tubes :to be,

sidev offthe shell vto .conduct into the space v :In the draw-ings# v r Y y u Fig. 1 isalongitudinal central section )of therein around the tubes18 the heating-fluid, one ormof heater embodying thejinyention; which may 'be hot.. water orsteam from V,the Fiofs.-2 andjS' are cross sectionalviewsfon boiler or furnace-of ya hot water or steam' .e5 the lines 2-' 2I andB-Sy, respectively,^of heating system, .or other heating agent.A w `75 Figl; v. Y M uThe head" 16 is providedwith a flange 21 Fig,4 is ajdiagrammaticview illustrating for attachment to the flange 14 by bolts22 the use of said heater, in connectionwith`a or the-like;y and with an annular rib,23 storage tank in'a domestic hot waterlsupply adaptedto bear on vthe tube sheet,for onV a' 3.0 system,'yfor heating and maintaining eireugasketlaidfthereom in acircuit surrounding 80 lation o-thewater Vin such tanlr'and supply thegarea kinjwhich vthev adjacentends of', the system; Y tubes arelocated. This `head kis recessedto l Fig. 5 isl a View similarto Fig.,1 showing provide an internal chamber- 24. l Connected f a. modified form of heater unitadapted to vto the head at ones'ide of va diametral or 35 heat and circulate Water in anuinber 'of sep medial-.plane of the unit isan eduction pipe `S5 aratefhot water-supplysystemsy Y 25.or-leading awaythe heated water. Figi-Gis a diagram;illustrating:thelise'ofy The opposite head'l'is of generally'silni-f the heater shown in Fig. 5 in connection with llar vcharacter,` with a flange v26, to receiye 'the twohotwaterfsupplysystemsg connecting bolts 27, anannular'rib 28, and

.'40 Fig 7f. is asunilar View illustratingtbe internal space or recess. `But it has inad'di- 0 0" 'same 'heater used-both to'furnish a supplylof tion an intermediate partition 29 `dividing its hot Waterlforwash'ing and like'purposes, and interior space into two chambersBO and t 0* CTCulate'hotWaterfforheating purposes. Two pipes 32 and 33, respeotiyely, are conv` Like reference Ycharactersv designate the `neete'dwith the-head 17,1one'ofthem openingy same partswherevertheyceur-in'all the1ginto each ohamber.- l The head is .preferably 1m35- l l f v v'nflade as' a'metal casting having holes at one rReferring first to the heatenshown-ninFigs.`. sidefto receive the .pipesf32 and 33, and .hay- 1A inc lusiye,tl1isy apparatu'sfeomprisesQan ing'the lpartition,ormecl` a sanintegralrib outer shell 1 1 with Whichare yunited integralextending between the holes.V 7 Preferablythe v 5 lyor separately as desired, end wallsfor tube wedgeof this rib liesnfthe same planen/ith- 199 i in the following specification. .Y ,l used.A Pipes 19 `and20 are connectedtouthe 70 'l I the annular rib 28 so that it bears against the tube sheet 13 or thepacking gasket 34 laid against the tube sheet, when the head 17 is applied to the shell. Thus the two chambers y, inthe head Yare then entirely shut off from one another. The partition 29 is so disposed with reference to the tubes 18 that a part of v`said tubes opens exclusively into one'of the' chambers, and aiiotlieipai't of `the tubes opens exclusively into thecther chamber.

Preferably also the-head 17 vis'so I'applied to l the shell that the pipe connections 32 and 33 i. medial f pipe 25.

are at the opposite side of a diametral or plane of the heater from theedu'ction kIt .follows Afrom the characteristics of the I heater above' described 'thatwater from .dif-

ferent sources may be conducted to the'heater through `the pipes 32 and 38, respectively,

i, heater where water is heated. "This same fifi Y' between the shell and both heads.

` tubes.

function and result may be accomplished by means" equivalentto the partition 29ofother construction and form, wherefore Ido ynot limit my invention and -protectionto the illustrated construction exclusively,V4 although I claim suchy construction as the ,best l means nowknown to me forv accomplishing I may observe at this lthe desired result.

Vpoint that my invention is not conditioned on obtaining an, absolute and total exclusionof the water in eitherr chamber 30 or 31 from the other, but my main object is accomplished if flow from one chamber to the otheriis made so difiicult that the path of least` resistance of the water-fis into and through theheating Neither do I limit my invention and protection to a construction in `which the number of ChannelsandV chambers forfeonduction and reception of incoming water is .two only, for 1t iswitlnn my contemplation to provide for a further subdivison intothree or Amore chambers or channels.

- The arrangement of the inlet pipes 32, 33, andthe outlet pipe 25, on opposite sides of a diametral plane is a featureof advantage, for which I claim protection, because it enables the heater to be used in a substantially horizontal position, with the inlet pipes at the lower side, as well as inthe upright posi-y tion here shown. i. i

I have shown in these. drawings gaskets 84 Y These gasketsnot only seal the oints between the heads ofthe shell, but they haver a further important function in. preventingl galvanic "acti-on between the tubes `and thetube Asheets vwhen these of d iiferentmetals, by kexcluding `water from Contact with'the outer surfaces of end wallsor tube sheets) through which the a tubesV pass, and no opportunity is given for gal-vanic actien, with consequent rapid corrosion of either the tubes or the shell, or both, V.to occur.A

A convenient mode of applying the gaskets Vand insuring't-he'desired character of'fcloseness between them and the tube'ends is to apply them tothe outer surfaces of the ends ofthe shell, or of the tube sheets in case vsepaL rate plates are provided as tube sheets, before y.;

theholes are drilled to vreceive the tube ends. The gaskets may then beplaced in shallow ydepressions in the tube sheets, as indicated in the drawings, and the holes drilled through both the t'ubesheets and the gaskets in one operation.L The tubes,fbeing 'then inserted and their ends expanded in the ordinary way, are brought into there'quired close and leak'- age tightcontact with the gaskets. Although inthe foregoing description I' have referred to the gaskets in the plural number, it is to 'be understood that the*description-which I have given applies to eachr gasket and either end of the shell, and to each tube which is thus Y combined with a gasket. i

I may use, for the purposes of such gaskets as I Vhere describe, sheets of lead or copper or other material. YIn this connection lead typifies a materialpwhich is inert to gavlanic action in the circumstances here considered,

and copper t-ypities material which is so silnilar to the material of which the tubes are made in its electrochemical nature, that no Vgalvanic electrical action between it and the tubes will take place in contact withwater lcontaining in solution the salts, etc; which cause such action to take similar metals.

It should be noted, however, that this fea'- place between disture of the invention is not limited to the provision of separate gaskets orpla'tes as the means for"preventing'the action which clauses rapid corrosion' in these circumstances, for lv may` also secure immunity iirthisfparticular other means, als, for instance, by plating or otherwise coating` the, outer faces of lthe tube sheets with copper or some other material which will give' immunity from the' o'bjectionable action'. e

rIhe form ofhefater just described lends it- Vselfto use in a system such as shown in lIllig. 4, to maintain circulation' of hot water throughout theV pipe line which conveys hot water to the places of use. Vhile this system was not rstinvented by mahnt is the lill) iso Maine, patented in Patent No. 1,730,736, Oc-

n tober 8, 1929, I will describe it briefly as illusheater,eduction pipeV 25,*pi'pe system 38, 39,

trating one of the-important vuses to which my improved heating unit is adapted. The

heater and its visible parts and connections are designated by the samelcharacterspre- Vviously used. The means'for supplying heat is typified by thefurnace or boiler 36of ay steam or hot water system, to the water space of which the pipes 19 and 20 are connected.

37 is a storage tank to the upperpart of which the eduction pipe 25 leads,.and`L from the l lower part of which the pipe 32' leads to the heater. The hot watersupply pipe 38 issues from the top of the storage tank and is coupled to a pipe 39 'which typifies a supplypipe or system of pipes leading tothe various places where hot water is to be `supplied and from which there are branches 40, 41, etc., to the various hot water faucets or other outlets. A return pipe 42 is connected by a pipe 43 with the induction pipe 33. So long as heatis supplied by the-boiler water to the water heater,- a circulation is maintained not only in the circuit formed by the storage tan-k, l the heater 11, and the pipe connections 25 and 32, but also in the longer circuit-made bythe 42, 43, and the separate channel in the head 17 to which the induction pipe 33 leads. Such a circulation is insured by Athe partition 2,9

'or its equivalent whichv compels all the water entering the heater to flow into the `heating tubes, where it is 'heated and caused to rise, andk prevents or hinders flow yof cold water from the lower partV of the tank and pipe 32 into the pipe 33. In the absence of the partition-.a reversed flow of water upon-,opening a faucet, might occur throughpipes 372,33 and 43 from the lower levels of the tank, par.- ticularly when the opened faucet is so 'located that the pathto it is shorter in this direction y; but with the partition,` flow to an opened faucet can take place only in the direction of the prescribed circulation. Such" circula-- tion keeps thewater hot up to Vall the points "from which the branches 40,41, etc. lead to the several faucets. V n 1 Referring now to the heater or unit shown in Fig. 5, this is like the one first described, in substance, in all but the following particulars. First, the headA 16a, unlike the head 16,

hut like the head 17, is dividedV by an interior partition. 44 into two chambers 45 and 46, and there are two eduction pipes 25.a and 25b coupled tothe head and opening into the respective chambers. This head-is applied to the heater shell in suchfa way that'those heating pipes'wliich openinto the chamber 30 lead also into the chamber 46, and those which open intothey chamberv 31. lead to the chamber 45. Thus there is not only a separation between water entering'the heater from- .f different sources, `lout'a like separation is gator .54

maintained aste thS-lfvaterk leaving it. ,This

heater'therefore is adaptedto-serve such a use-,as that shown -in Fig. f6, whereseparatje supplies; of circulating hot `water are ,fur-

nished for different apartments Thestorage tank47andjtheconducting system asso`v Yc'iated therewith, for one apartmenuare connectedbyfpipes .48y and 49with the eduction4 pipe 25`an1d induction pipe 33 or thelheater;

whilethe storage .tank 50fofanother apartmentis connected by pipes 51 and 52 with-vL the eduetion pipe 25b and inductionpipe 32.

.While f' a i single j. heating .unit provides '-fhoth,`

water-for both apartments, thelsup'ly .sys-

tems of the different apartments are separate fromvone another, and the occupantsof each can ,draw hot-water Vwithout diminishing the supply availableatthe same time for the oc;

tem-rmoreover, at least-as .fari-as the storage tank, and a continuous supply of hot ,water is maintained in each storage .tank readily for' instant.y delivery, when demanded.

as* supplying through one: of its-channelshot 'watertoa storage tank 53 for the same purpose as laststated, and through anotherchan'- .nel and pipes V5 1a .and 52e.y toj aheating r'adila :garage or otl'ier` detached ingfp" Itis it Tte uiicirsiodf lin this ycas alsothti the 'fiow'j channels :inthe heater may be sub-l l divided linto more than two as ,in case separate water supplies are to be heated for more 'than two apartments, etc., and also that the kdifferent channels or flow spaces in the same heater may `be of unequal areas or volumes..

one end of the heater may be at the opposite opposite end, as shown and described in conaccording toy theV requirements forfheat of eac-hfwatersystem. It will also be'under- .y stood that the pipes leading to the head at" nection with Fig. 1, wherefore the last described form of heater may also be used in a horizontal position.

feature shown in Fig. 5 is An additional the provision of openings in the opposite sides of the shell in either of which 'pipes for circulating'the heating fluidfinay be counected. The openingsnot used forrthis purpose are stoppedby plugs 55. kThie provision enables the heater to rbe installed easily Viii 'v situations where connection with supply or return pipescould not lbe well made at one particular side, or both at the saine'side, and

also enables` connection to be made for ciri culating heatingfluidfurnished by two oi" more different sources at the same time.

vWhat I vclaim and desire'rto secure by Let- 'Y i ters Patentis:

`v`l.' "A domestic water heating unit eoinprising a shell having 'tube sheets at opposite ends and pipe connections in its-sides, conducting tubes fitted and secured at their-ends `in holes in the lrespective tube sheets, and

heads secured toopposite vends of the shell over the openings to 'theftubes, one of the heads havinga single Vinterior!chain-ber into Whiehall of the tubes open and from which g there is a het Water outlet',- and the other` 10` vid-Ing 1t vinto tvvo'chambers into each voit whichv different groups of tubes open sephaving an interior transverse 'partition dil Y a'rately andexclusivelyand into each of which there'y is an inlet for Waterto be heated.

2. A domestic/vater heating unit `Jor use in a hotv Water system pro-vided vWith separate return channels ,which consists in a 'shell having inner tube-sheets at opposite ends, tubes extending through the space from one sheet to the other,y pipe connections in the side of theshell opening to the space around said tubes and between the tube sheets `for fa'heating agent, andV heads at opposite ends of the shell enclosing chambers into which the said: tubes open, oneoi:l said heads having an outlet for eduction of heatedwater and the other head having'an interior partition dividing it into separate chambers and having separate connectionsL to the different chambers for inlet of Water through the separate return channels off-the water system.

signature.

Injtestirnony whereof I have afliXed my K ELMER s STACK 

